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PPM limit?


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13 replies to this topic

#1 MadSmokerModa

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Posted 18 March 2010 - 02:26 PM

After 4 years of not being able to grow im back at it and I have a question. I have a DWC system and when I do a fresh fluid change my avrg PPM is about 1,000. Thats with flora grow, micro, and, super thrive in 5 gallon buckets. My question is at about what PPM level should I do a system flush?

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#2 Earl

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Posted 19 March 2010 - 08:28 AM

every week

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#3 MadSmokerModa

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Posted 19 March 2010 - 03:19 PM

I know to do a system flush once a week regardless but I was wondering if any one had any actual numbers as to when a 5 gallon DWC system becomes toxic.

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#4 Esandy

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Posted 27 March 2010 - 12:20 PM

PPM for Hanna Chart PPM


Seedlings, Early Sprouts 100 to 250

Early Vegging 300 to 400

Full Vegetation 450 to 700

Early Blooming 750 to 950

Full Mature Blooms 1000 to 1600

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#5 Earl

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Posted 28 March 2010 - 04:34 AM

PPM for Hanna Chart PPM


Seedlings, Early Sprouts 100 to 250

Early Vegging 300 to 400

Full Vegetation 450 to 700

Early Blooming 750 to 950

Full Mature Blooms 1000 to 1600

Follow this plan,
and your buds will be dry,
and burn hot.

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#6 Harvey_M

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Posted 28 March 2010 - 11:52 AM

No one even answered the original question, what ppm should you flush with. Probably because the next question was totally different, what ppm the dwc solution becomes toxic.
First, 0ppm, right? Why do some people say to never do this, and only flush with low nutrient level solutions?

Second. I have no idea. I figure the plants will show you.
My dwc thing is at about 2x the ppm of my aero/nft setup. Why it works like this, I also don't know.

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#7 Earl

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Posted 28 March 2010 - 04:45 PM

First, 0ppm, right?

yes

Originally Posted By: Harvey_M
Why do some people say to never do this, and only flush with low nutrient level solutions?
I don't know

Originally Posted By: Harvey_M

Second. I have no idea. I figure the plants will show you.
My dwc thing is at about 2x the ppm of my aero/nft setup. Why it works like this, I also don't know.


You can grow in dwc
with the same nute loads
you'll use in aero
.

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#8 Harvey_M

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Posted 28 March 2010 - 07:57 PM

Maybe you can, I can't..at 500ppm, my dwc plant's leaves were looking very pale, and at 500ppm in my "aero" setup, the plants get burned badly.

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#9 newtoaero

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Posted 10 April 2010 - 04:58 PM

the recommended rates on the bottles are mixed into a 0 ppm water. You must use r/o or distilled water if you want to run ppms that high. The calcium and magnesium in most tap water block the nutrient uptake and also make the water hard to ph balance. Get an r/o machine! they are the shit! I run 1200ppm with no leaf burn!

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#10 Harvey_M

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Posted 11 April 2010 - 06:20 PM

Why would you assume anyone in this thread isn't using an RO? I mentioned flushing with 0ppm, so the RO is kind of a given..at least to me..

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End the Fed.

#11 Earl

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Posted 12 April 2010 - 08:17 AM

1200ppm of Pure Blend Pro is not the same as 1200ppm of advanced nutrients
you guys are comparing apples and oranges.

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#12 PirateSteve420z

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Posted 12 April 2010 - 04:25 PM

I agree with EARL!!! Look at my grofile...http://forums.cannabisculture.com/forums/ubbthreads.php?ubb=showflat&Number=1628703&#Post1628703

Follow his steps and you'll get something like mine if not better! Follow someone else... and I wouldn't even want to smoke your budz even if they were free! Just IMHO! Hahahahahahah Earlz the shit... if you don't listen to him, you grow shit! hahahahaha

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#13 FreddyMac

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Posted 26 April 2010 - 01:41 PM

Im just a lucky MoFo, My First DWC Setup Im In day 27 of flower, with 2 females that are gorgeous. I flowered at 14 inches, now they are pushing 50 inches, really nice bud development, and I have not had any problems outside light/heat burn (and im talking maybe 3 or 4 fan leaves got burned nothing serious).

I have changed the 15-18 gallon tank ONCE ! And that one time was when I switched from veg to flower. I thoroughly clean and sterilized all gear in the setup, and refilled, 27 days later the water look nice and clear, and healthy, my pH is always in the 5.9-6.1 range, and they are going to be some very bountiful harvesting and pleasure smoking soon.

You can check this thread for more info on the grow:
http://forums.cannab...598#Post1628598

I plan on changing the water once more, and that is to flush
i'll do that in another 20 days.

I believe that proper care and cleanliness play a big role in why i have had the good luck, but my theory is...

If it's not broken, then dont fix it ;-)



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#14 potheadME

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Posted 27 April 2010 - 10:37 AM

I am glad that approach has worked out for you. However, that approach far more commonly results in disaster for the plants.

For most the best approach is likely one less extreme. Change your solutions weekly and you won't have a problem.

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